Files: f65379392f63738750a80ce19d6c9d6d454c86d3 / index.js
12966 bytesRaw
1 | var pull = require('pull-stream') |
2 | var cat = require('pull-cat') |
3 | var buffered = require('pull-buffered') |
4 | var pack = require('./lib/pack') |
5 | var pktLine = require('./lib/pkt-line') |
6 | var util = require('./lib/util') |
7 | var multicb = require('multicb') |
8 | var ProgressBar = require('progress') |
9 | |
10 | function handleOption(options, name, value) { |
11 | switch (name) { |
12 | case 'verbosity': |
13 | options.verbosity = +value || 0 |
14 | return true |
15 | case 'progress': |
16 | options.progress = !!value && value !== 'false' |
17 | return true |
18 | default: |
19 | console.error('unknown option', name + ': ' + value) |
20 | return false |
21 | } |
22 | } |
23 | |
24 | function capabilitiesSource() { |
25 | return pull.once([ |
26 | 'option', |
27 | 'connect', |
28 | ].join('\n') + '\n\n') |
29 | } |
30 | |
31 | function optionSource(cmd, options) { |
32 | var args = util.split2(cmd) |
33 | var msg = handleOption(options, args[0], args[1]) |
34 | msg = (msg === true) ? 'ok' |
35 | : (msg === false) ? 'unsupported' |
36 | : 'error ' + msg |
37 | return pull.once(msg + '\n') |
38 | } |
39 | |
40 | // transform ref objects into lines |
41 | function listRefs(read) { |
42 | var ended |
43 | return function (abort, cb) { |
44 | if (ended) return cb(ended) |
45 | read(abort, function (end, ref) { |
46 | ended = end |
47 | if (end === true) cb(null, '\n') |
48 | if (end) cb(end) |
49 | else cb(null, |
50 | [ref.value, ref.name].concat(ref.attrs || []).join(' ') + '\n') |
51 | }) |
52 | } |
53 | } |
54 | |
55 | // upload-pack: fetch to client |
56 | function uploadPack(read, repo, options) { |
57 | /* multi_ack thin-pack side-band side-band-64k ofs-delta shallow no-progress |
58 | * include-tag multi_ack_detailed |
59 | * agent=git/2.7.0 */ |
60 | var sendRefs = receivePackHeader([ |
61 | ], repo.refs(), repo.symrefs(), false) |
62 | |
63 | var lines = pktLine.decode(read, options) |
64 | var readHave = lines.haves() |
65 | var acked |
66 | var commonHash |
67 | var sendPack |
68 | var wants = {} |
69 | var shallows = {} |
70 | |
71 | // Packfile negotiation |
72 | return cat([ |
73 | pktLine.encode(cat([ |
74 | sendRefs, |
75 | pull.once(''), |
76 | function (abort, cb) { |
77 | if (abort) return |
78 | if (acked) return cb(true) |
79 | |
80 | // read upload request (wants list) from client |
81 | var readWant = lines.wants() |
82 | readWant(null, function (end, want) { |
83 | if (end === true) return cb(true) // early client disconnect |
84 | else if (end) cb(end) |
85 | else nextWant(null, want) |
86 | }) |
87 | function nextWant(end, want) { |
88 | if (end) return wantsDone(end === true ? null : end) |
89 | if (want.type == 'want') { |
90 | wants[want.hash] = true |
91 | } else if (want.type == 'shallow') { |
92 | shallows[want.hash] = true |
93 | } else { |
94 | var err = new Error("Unknown thing", want.type, want.hash) |
95 | return readWant(err, function (e) { cb(e || err) }) |
96 | } |
97 | readWant(null, nextWant) |
98 | } |
99 | |
100 | function wantsDone(err) { |
101 | if (err) return cb(err) |
102 | // Read upload haves (haves list). |
103 | // On first obj-id that we have, ACK |
104 | // If we have none, NAK. |
105 | // TODO: implement multi_ack_detailed |
106 | readHave(null, function next(end, have) { |
107 | if (end === true) { |
108 | // found no common object |
109 | acked = true |
110 | cb(null, 'NAK') |
111 | } else if (end) |
112 | cb(end) |
113 | else if (have.type != 'have') |
114 | cb(new Error('Unknown have' + JSON.stringify(have))) |
115 | else |
116 | repo.hasObject(have.hash, function (err, haveIt) { |
117 | if (err) return cb(err) |
118 | if (!haveIt) |
119 | return readHave(null, next) |
120 | commonHash = haveIt |
121 | acked = true |
122 | cb(null, 'ACK ' + have.hash) |
123 | }) |
124 | }) |
125 | } |
126 | }, |
127 | ])), |
128 | |
129 | function havesDone(abort, cb) { |
130 | if (abort) return cb(abort) |
131 | // send pack file to client |
132 | if (sendPack) |
133 | return sendPack(abort, cb) |
134 | getObjects(repo, commonHash, wants, shallows, |
135 | function (err, numObjects, readObjects) { |
136 | if (err) return cb(err) |
137 | var progress = progressObjects(options) |
138 | progress.setNumObjects(numObjects) |
139 | sendPack = pack.encode(options, numObjects, |
140 | progress(readObjects)) |
141 | havesDone(abort, cb) |
142 | } |
143 | ) |
144 | } |
145 | ]) |
146 | } |
147 | |
148 | // through stream to show a progress bar for objects being read |
149 | function progressObjects(options) { |
150 | // Only show progress bar if it is requested and if it won't interfere with |
151 | // the debug output |
152 | if (!options.progress || options.verbosity > 1) { |
153 | var dummyProgress = function (readObject) { return readObject } |
154 | dummyProgress.setNumObjects = function () {} |
155 | return dummyProgress |
156 | } |
157 | |
158 | var numObjects |
159 | var size = process.stderr.columns |
160 | var bar = new ProgressBar(':percent :bar', { |
161 | total: size, |
162 | clear: true |
163 | }) |
164 | |
165 | var progress = function (readObject) { |
166 | return function (abort, cb) { |
167 | readObject(abort, function next(end, object) { |
168 | if (end === true) { |
169 | bar.terminate() |
170 | } else if (!end) { |
171 | var name = object.type + ' ' + object.length |
172 | bar.tick(size / numObjects) |
173 | } |
174 | |
175 | cb(end, object) |
176 | }) |
177 | } |
178 | } |
179 | // TODO: put the num objects in the objects stream as a header object |
180 | progress.setNumObjects = function (n) { |
181 | numObjects = n |
182 | } |
183 | return progress |
184 | } |
185 | |
186 | function getObjects(repo, commonHash, heads, shallows, cb) { |
187 | // get objects from commonHash to each head, inclusive. |
188 | // if commonHash is falsy, use root |
189 | var objects = [] |
190 | var objectsAdded = {} |
191 | var done = multicb({pluck: 1}) |
192 | var ended |
193 | |
194 | // walk back from heads until get to commonHash |
195 | for (var hash in heads) |
196 | addObject(hash, done()) |
197 | |
198 | // TODO: only add new objects |
199 | |
200 | function addObject(hash, cb) { |
201 | if (ended) return cb(ended) |
202 | if (hash in objectsAdded || hash == commonHash) return cb() |
203 | objectsAdded[hash] = true |
204 | repo.getObject(hash, function (err, object) { |
205 | if (err) return cb(err) |
206 | if (object.type == 'blob') { |
207 | objects.push(object) |
208 | cb() |
209 | } else { |
210 | // object must be read twice, so buffer it |
211 | bufferObject(object, function (err, object) { |
212 | if (err) return cb(err) |
213 | objects.push(object) |
214 | var hashes = getObjectLinks(object) |
215 | for (var sha1 in hashes) |
216 | addObject(sha1, done()) |
217 | cb() |
218 | }) |
219 | } |
220 | }) |
221 | } |
222 | |
223 | done(function (err) { |
224 | if (err) return cb(err) |
225 | cb(null, objects.length, pull.values(objects)) |
226 | }) |
227 | } |
228 | |
229 | function bufferObject(object, cb) { |
230 | pull( |
231 | object.read, |
232 | pull.collect(function (err, bufs) { |
233 | if (err) return cb(err) |
234 | var buf = Buffer.concat(bufs, object.length) |
235 | cb(null, { |
236 | type: object.type, |
237 | length: object.length, |
238 | data: buf, |
239 | read: pull.once(buf) |
240 | }) |
241 | }) |
242 | ) |
243 | } |
244 | |
245 | // get hashes of git objects linked to from other git objects |
246 | function getObjectLinks(object, cb) { |
247 | switch (object.type) { |
248 | case 'blob': |
249 | return {} |
250 | case 'tree': |
251 | return getTreeLinks(object.data) |
252 | case 'tag': |
253 | case 'commit': |
254 | return getCommitOrTagLinks(object.data) |
255 | } |
256 | } |
257 | |
258 | function getTreeLinks(buf) { |
259 | var links = {} |
260 | for (var i = 0, j; j = buf.indexOf(0, i, 'ascii') + 1; i = j + 20) { |
261 | var hash = buf.slice(j, j + 20).toString('hex') |
262 | if (!(hash in links)) |
263 | links[hash] = true |
264 | } |
265 | return links |
266 | } |
267 | |
268 | function getCommitOrTagLinks(buf) { |
269 | var lines = buf.toString('utf8').split('\n') |
270 | var links = {} |
271 | // iterate until reach blank line (indicating start of commit/tag body) |
272 | for (var i = 0; lines[i]; i++) { |
273 | var args = lines[i].split(' ') |
274 | switch (args[0]) { |
275 | case 'tree': |
276 | case 'parent': |
277 | case 'object': |
278 | var hash = args[1] |
279 | if (!(hash in links)) |
280 | links[hash] = true |
281 | } |
282 | } |
283 | return links |
284 | } |
285 | |
286 | /* |
287 | TODO: investigate capabilities |
288 | report-status delete-refs side-band-64k quiet atomic ofs-delta |
289 | */ |
290 | |
291 | // Get a line for each ref that we have. The first line also has capabilities. |
292 | // Wrap with pktLine.encode. |
293 | function receivePackHeader(capabilities, refSource, symrefs, usePlaceholder) { |
294 | var first = true |
295 | var symrefed = {} |
296 | var symrefsObj = {} |
297 | |
298 | return cat([ |
299 | function (end, cb) { |
300 | if (end) cb(true) |
301 | else if (!symrefs) cb(true) |
302 | else pull( |
303 | symrefs, |
304 | pull.map(function (sym) { |
305 | symrefed[sym.ref] = true |
306 | symrefsObj[sym.name] = sym.ref |
307 | return 'symref=' + sym.name + ':' + sym.ref |
308 | }), |
309 | pull.collect(function (err, symrefCaps) { |
310 | if (err) return cb(err) |
311 | capabilities = capabilities.concat(symrefCaps) |
312 | cb(true) |
313 | }) |
314 | ) |
315 | }, |
316 | pull( |
317 | refSource, |
318 | pull.map(function (ref) { |
319 | // insert symrefs next to the refs that they point to |
320 | var out = [ref] |
321 | if (ref.name in symrefed) |
322 | for (var symrefName in symrefsObj) |
323 | if (symrefsObj[symrefName] === ref.name) |
324 | out.push({name: symrefName, hash: ref.hash}) |
325 | return out |
326 | }), |
327 | pull.flatten(), |
328 | pull.map(function (ref) { |
329 | var name = ref.name |
330 | var value = ref.hash |
331 | if (first && usePlaceholder) { |
332 | first = false |
333 | /* |
334 | if (end) { |
335 | // use placeholder data if there are no refs |
336 | value = '0000000000000000000000000000000000000000' |
337 | name = 'capabilities^{}' |
338 | } |
339 | */ |
340 | name += '\0' + capabilities.join(' ') |
341 | } |
342 | return value + ' ' + name |
343 | }) |
344 | ) |
345 | ]) |
346 | } |
347 | |
348 | // receive-pack: push from client |
349 | function receivePack(read, repo, options) { |
350 | var sendRefs = receivePackHeader([ |
351 | 'delete-refs', |
352 | ], repo.refs(), null, true) |
353 | var done = multicb({pluck: 1}) |
354 | |
355 | return pktLine.encode( |
356 | cat([ |
357 | // send our refs |
358 | sendRefs, |
359 | pull.once(''), |
360 | function (abort, cb) { |
361 | if (abort) return |
362 | // receive their refs |
363 | var lines = pktLine.decode(read, options) |
364 | pull( |
365 | lines.updates, |
366 | pull.collect(function (err, updates) { |
367 | if (err) return cb(err) |
368 | if (updates.length === 0) return cb(true) |
369 | var progress = progressObjects(options) |
370 | repo.update(pull.values(updates), pull( |
371 | lines.passthrough, |
372 | pack.decode({ |
373 | verbosity: options.verbosity, |
374 | onHeader: function (numObjects) { |
375 | progress.setNumObjects(numObjects) |
376 | } |
377 | }, repo, done()), |
378 | progress |
379 | ), done()) |
380 | done(function (err) { |
381 | cb(err || true) |
382 | }) |
383 | }) |
384 | ) |
385 | }, |
386 | pull.once('unpack ok') |
387 | ]) |
388 | ) |
389 | } |
390 | |
391 | function prepend(data, read) { |
392 | var done |
393 | return function (end, cb) { |
394 | if (done) { |
395 | read(end, cb) |
396 | } else { |
397 | done = true |
398 | cb(null, data) |
399 | } |
400 | } |
401 | } |
402 | |
403 | module.exports = function (repo) { |
404 | var ended |
405 | var options = { |
406 | verbosity: 1, |
407 | progress: false |
408 | } |
409 | |
410 | function handleConnect(cmd, read) { |
411 | var args = util.split2(cmd) |
412 | switch (args[0]) { |
413 | case 'git-upload-pack': |
414 | return prepend('\n', uploadPack(read, repo, options)) |
415 | case 'git-receive-pack': |
416 | return prepend('\n', receivePack(read, repo, options)) |
417 | default: |
418 | return pull.error(new Error('Unknown service ' + args[0])) |
419 | } |
420 | } |
421 | |
422 | function handleCommand(line, read) { |
423 | var args = util.split2(line) |
424 | switch (args[0]) { |
425 | case 'capabilities': |
426 | return capabilitiesSource() |
427 | case 'list': |
428 | return listRefs(refSource) |
429 | case 'connect': |
430 | return handleConnect(args[1], read) |
431 | case 'option': |
432 | return optionSource(args[1], options) |
433 | default: |
434 | return pull.error(new Error('Unknown command ' + line)) |
435 | } |
436 | } |
437 | |
438 | return function (read) { |
439 | var b = buffered() |
440 | b(read) |
441 | var command |
442 | |
443 | function getCommand(cb) { |
444 | b.lines(null, function next(end, line) { |
445 | if (ended = end) |
446 | return cb(end) |
447 | |
448 | if (line == '') |
449 | return b.lines(null, next) |
450 | |
451 | if (options.verbosity > 1) |
452 | console.error('command:', line) |
453 | |
454 | var cmdSource = handleCommand(line, b.passthrough) |
455 | cb(null, cmdSource) |
456 | }) |
457 | } |
458 | |
459 | return function next(abort, cb) { |
460 | if (ended) return cb(ended) |
461 | |
462 | if (!command) { |
463 | if (abort) return |
464 | getCommand(function (end, cmd) { |
465 | command = cmd |
466 | next(end, cb) |
467 | }) |
468 | return |
469 | } |
470 | |
471 | command(abort, function (err, data) { |
472 | if (err) { |
473 | command = null |
474 | if (err !== true) |
475 | cb(err, data) |
476 | else |
477 | next(abort, cb) |
478 | } else { |
479 | // HACK: silence error when writing to closed stream |
480 | try { |
481 | cb(null, data) |
482 | } catch(e) { |
483 | if (e.message == 'process.stdout cannot be closed.' |
484 | || e.message == 'This socket is closed.') |
485 | process.exit(1) |
486 | throw e |
487 | } |
488 | } |
489 | }) |
490 | } |
491 | } |
492 | } |
493 |
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